Need help with Cat litter

We have been using Tidy Cats litter for ages, recently however we have found that it doesn't clump anymore and just leaves a sludge. Not sure if the formulation has changed, Partner commented on it seeming finer in appearance and less granular.

Looking for recommendations for an alternative brand that you have had success with. The alternative cannot be scented as partner is sensitive to artificial scents.

We have 2 male cats if that helps.

Appreciate the help.